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<a name="1" href="#1">1</a>   <em class="comment">/*</em>
<a name="2" href="#2">2</a>   <em class="comment"> * Licensed to the Apache Software Foundation (ASF) under one or more</em>
<a name="3" href="#3">3</a>   <em class="comment"> * contributor license agreements.  See the NOTICE file distributed with</em>
<a name="4" href="#4">4</a>   <em class="comment"> * this work for additional information regarding copyright ownership.</em>
<a name="5" href="#5">5</a>   <em class="comment"> * The ASF licenses this file to You under the Apache License, Version 2.0</em>
<a name="6" href="#6">6</a>   <em class="comment"> * (the "License"); you may not use this file except in compliance with</em>
<a name="7" href="#7">7</a>   <em class="comment"> * the License.  You may obtain a copy of the License at</em>
<a name="8" href="#8">8</a>   <em class="comment"> * </em>
<a name="9" href="#9">9</a>   <em class="comment"> *      <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a name="10" href="#10">10</a>  <em class="comment"> * </em>
<a name="11" href="#11">11</a>  <em class="comment"> * Unless required by applicable law or agreed to in writing, software</em>
<a name="12" href="#12">12</a>  <em class="comment"> * distributed under the License is distributed on an "AS IS" BASIS,</em>
<a name="13" href="#13">13</a>  <em class="comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em>
<a name="14" href="#14">14</a>  <em class="comment"> * See the License for the specific language governing permissions and</em>
<a name="15" href="#15">15</a>  <em class="comment"> * limitations under the License.</em>
<a name="16" href="#16">16</a>  <em class="comment"> */</em>
<a name="17" href="#17">17</a>  
<a name="18" href="#18">18</a>  <strong>package</strong> org.apache.log4j.varia;
<a name="19" href="#19">19</a>  
<a name="20" href="#20">20</a>  <strong>import</strong> org.apache.log4j.Logger;
<a name="21" href="#21">21</a>  <strong>import</strong> org.apache.log4j.BasicConfigurator;
<a name="22" href="#22">22</a>  
<a name="23" href="#23">23</a>  <strong>import</strong> java.io.IOException;
<a name="24" href="#24">24</a>  <strong>import</strong> java.io.DataInputStream;
<a name="25" href="#25">25</a>  <strong>import</strong> java.io.DataOutputStream;
<a name="26" href="#26">26</a>  <strong>import</strong> java.net.Socket;
<a name="27" href="#27">27</a>  
<a name="28" href="#28">28</a>  <em>/**<em>*</em></em>
<a name="29" href="#29">29</a>  <em>   A simple application to send roll over messages to a potentially</em>
<a name="30" href="#30">30</a>  <em>   remote {@link ExternallyRolledFileAppender}. </em>
<a name="31" href="#31">31</a>  
<a name="32" href="#32">32</a>  <em>   &lt;p>It takes two arguments, the &lt;code>host_name&lt;/code> and</em>
<a name="33" href="#33">33</a>  <em>   &lt;code>port_number&lt;/code> where the</em>
<a name="34" href="#34">34</a>  <em>   &lt;code>ExternallyRolledFileAppender&lt;/code> is listening.</em>
<a name="35" href="#35">35</a>  <em>   </em>
<a name="36" href="#36">36</a>  
<a name="37" href="#37">37</a>  <em>   @author Ceki G&amp;uuml;lc&amp;uuml;</em>
<a name="38" href="#38">38</a>  <em>   @since version 0.9.0 */</em>
<a name="39" href="#39">39</a>  <strong>public</strong> <strong>class</strong> <a href="../../../../org/apache/log4j/varia/Roller.html">Roller</a> {
<a name="40" href="#40">40</a>  
<a name="41" href="#41">41</a>    <strong>static</strong> <a href="../../../../org/apache/log4j/Logger.html">Logger</a> cat = Logger.getLogger(Roller.<strong>class</strong>);
<a name="42" href="#42">42</a>    
<a name="43" href="#43">43</a>  
<a name="44" href="#44">44</a>    <strong>static</strong> String host;
<a name="45" href="#45">45</a>    <strong>static</strong> <strong>int</strong> port;
<a name="46" href="#46">46</a>  
<a name="47" href="#47">47</a>    <em class="comment">// Static class.</em>
<a name="48" href="#48">48</a>    <a href="../../../../org/apache/log4j/varia/Roller.html">Roller</a>() {
<a name="49" href="#49">49</a>    }
<a name="50" href="#50">50</a>  
<a name="51" href="#51">51</a>    <em>/**<em>*</em></em>
<a name="52" href="#52">52</a>  <em>     Send a "RollOver" message to</em>
<a name="53" href="#53">53</a>  <em>     &lt;code>ExternallyRolledFileAppender&lt;/code> on &lt;code>host&lt;/code></em>
<a name="54" href="#54">54</a>  <em>     and &lt;code>port&lt;/code>.</em>
<a name="55" href="#55">55</a>  
<a name="56" href="#56">56</a>  <em>   */</em>
<a name="57" href="#57">57</a>    <strong>public</strong> 
<a name="58" href="#58">58</a>    <strong>static</strong> 
<a name="59" href="#59">59</a>    <strong>void</strong> main(String argv[]) {
<a name="60" href="#60">60</a>  
<a name="61" href="#61">61</a>      BasicConfigurator.configure();
<a name="62" href="#62">62</a>  
<a name="63" href="#63">63</a>      <strong>if</strong>(argv.length == 2) 
<a name="64" href="#64">64</a>        init(argv[0], argv[1]);
<a name="65" href="#65">65</a>      <strong>else</strong> 
<a name="66" href="#66">66</a>        usage(<span class="string">"Wrong number of arguments."</span>);
<a name="67" href="#67">67</a>      
<a name="68" href="#68">68</a>      roll();
<a name="69" href="#69">69</a>    }
<a name="70" href="#70">70</a>  
<a name="71" href="#71">71</a>    <strong>static</strong>
<a name="72" href="#72">72</a>    <strong>void</strong> usage(String msg) {
<a name="73" href="#73">73</a>      System.err.println(msg);
<a name="74" href="#74">74</a>      System.err.println( <span class="string">"Usage: java "</span> + Roller.<strong>class</strong>.getName() +
<a name="75" href="#75">75</a>  			<span class="string">"host_name port_number"</span>);
<a name="76" href="#76">76</a>      System.exit(1);
<a name="77" href="#77">77</a>    }
<a name="78" href="#78">78</a>  
<a name="79" href="#79">79</a>    <strong>static</strong> 
<a name="80" href="#80">80</a>    <strong>void</strong> init(String hostArg, String portArg) {
<a name="81" href="#81">81</a>      host = hostArg;
<a name="82" href="#82">82</a>      <strong>try</strong> {
<a name="83" href="#83">83</a>        port =  Integer.parseInt(portArg);
<a name="84" href="#84">84</a>      }
<a name="85" href="#85">85</a>      <strong>catch</strong>(java.lang.NumberFormatException e) {
<a name="86" href="#86">86</a>        usage(<span class="string">"Second argument "</span>+portArg+<span class="string">" is not a valid integer."</span>);
<a name="87" href="#87">87</a>      }
<a name="88" href="#88">88</a>    }
<a name="89" href="#89">89</a>  
<a name="90" href="#90">90</a>    <strong>static</strong>
<a name="91" href="#91">91</a>    <strong>void</strong> roll() {
<a name="92" href="#92">92</a>      <strong>try</strong> {
<a name="93" href="#93">93</a>        Socket socket = <strong>new</strong> Socket(host, port);
<a name="94" href="#94">94</a>        DataOutputStream dos = <strong>new</strong> DataOutputStream(socket.getOutputStream());
<a name="95" href="#95">95</a>        DataInputStream dis = <strong>new</strong> DataInputStream(socket.getInputStream());
<a name="96" href="#96">96</a>        dos.writeUTF(ExternallyRolledFileAppender.ROLL_OVER);
<a name="97" href="#97">97</a>        String rc = dis.readUTF();
<a name="98" href="#98">98</a>        <strong>if</strong>(ExternallyRolledFileAppender.OK.equals(rc)) {
<a name="99" href="#99">99</a>  	cat.info(<span class="string">"Roll over signal acknowledged by remote appender."</span>);
<a name="100" href="#100">100</a>       } <strong>else</strong> {
<a name="101" href="#101">101</a> 	cat.warn(<span class="string">"Unexpected return code "</span>+rc+<span class="string">" from remote entity."</span>);
<a name="102" href="#102">102</a> 	System.exit(2);
<a name="103" href="#103">103</a>       }
<a name="104" href="#104">104</a>     } <strong>catch</strong>(IOException e) {
<a name="105" href="#105">105</a>       cat.error(<span class="string">"Could not send roll signal on host "</span>+host+<span class="string">" port "</span>+port+<span class="string">" ."</span>,
<a name="106" href="#106">106</a> 		e);
<a name="107" href="#107">107</a>       System.exit(2);
<a name="108" href="#108">108</a>     }
<a name="109" href="#109">109</a>     System.exit(0);
<a name="110" href="#110">110</a>   }
<a name="111" href="#111">111</a> }
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